coan.net: Yeah, but once a 1 is shown, there will be often be "safe" shots, that neither reveal where the frog is, and still reveal a 1. Example:

  +---+---+---+
5 | 0 |   |   |   
  +---+---+---+
4 |   |   |   |   
  +---+---+---+
3 |   |   |   | 
  +---+---+---+
2 |   |   |   |   
  +---+---+---+
1 | 0 |   |   |   
  +---+---+---+
    a   b   c   

If a shot on a2 reveals a 1, the opponent can shoot on a4, also revealing a 1, cancelling any benefits from revealing a non-0.